春季 HTTP 客户端

java spring

2022-08-31 16:43:02

我是Spring的新手，我需要我的Java应用程序通过HTTP（JSON，RESTful）连接到另一个API。Spring Framework是否有类似于JSON HTTP Rest Client的东西？Spring开发人员通常使用什么？

答案 1

我通过以下方式实现了我需要的：

import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;

public class RestClient {

  private String server = "http://localhost:3000";
  private RestTemplate rest;
  private HttpHeaders headers;
  private HttpStatus status;

  public RestClient() {
    this.rest = new RestTemplate();
    this.headers = new HttpHeaders();
    headers.add("Content-Type", "application/json");
    headers.add("Accept", "*/*");
  }

  public String get(String uri) {
    HttpEntity<String> requestEntity = new HttpEntity<String>("", headers);
    ResponseEntity<String> responseEntity = rest.exchange(server + uri, HttpMethod.GET, requestEntity, String.class);
    this.setStatus(responseEntity.getStatusCode());
    return responseEntity.getBody();
  }

  public String post(String uri, String json) {   
    HttpEntity<String> requestEntity = new HttpEntity<String>(json, headers);
    ResponseEntity<String> responseEntity = rest.exchange(server + uri, HttpMethod.POST, requestEntity, String.class);
    this.setStatus(responseEntity.getStatusCode());
    return responseEntity.getBody();
  }

  public void put(String uri, String json) {
    HttpEntity<String> requestEntity = new HttpEntity<String>(json, headers);
    ResponseEntity<String> responseEntity = rest.exchange(server + uri, HttpMethod.PUT, requestEntity, null);
    this.setStatus(responseEntity.getStatusCode());   
  }

  public void delete(String uri) {
    HttpEntity<String> requestEntity = new HttpEntity<String>("", headers);
    ResponseEntity<String> responseEntity = rest.exchange(server + uri, HttpMethod.DELETE, requestEntity, null);
    this.setStatus(responseEntity.getStatusCode());
  }

  public HttpStatus getStatus() {
    return status;
  }

  public void setStatus(HttpStatus status) {
    this.status = status;
  } 
}

答案 2

最简单的是使用，在官方Spring博客上查看这篇文章：RestTemplate

RestTemplate 是用于客户端 HTTP 访问的中心 Spring 类。

这是 GET 的一个示例：

String result = restTemplate.getForObject("http://example.com/hotels/{hotel}/bookings/{booking}", String.class, "42", "21");